Call your travel agent, and see if they can give you a more specific way to find out, or a number to call.. Many times, the charter flights are not listed in a place that can be readily acceessed by reservation people, as they are NOT sold by the airline itself, but rather the tour group/company or travel agent. (I work for a pure charter airline)..

Also, look on your reservation confirmations.. I know that the ones that our pax get (Either through Apple or Funjet vacations, directly or via a travel agent) will tell the name of the airline. Our first flight to AUA this year, we picked up pax brought down by ATA, and most, if not all, had never heard of Ryan International Airlines. But we were there..